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Showing content from https://cplusplus.com/reference/type_traits/is_volatile/ below:

class template

<type_traits>

std::is_volatile

template <class T> struct is_volatile;

Is volatile-qualified

Trait class that identifies whether T is a volatile-qualified type.

It inherits from integral_constant as being either true_type or false_type, depending on whether T is volatile.

Template parameters

T: A type.

Member types Inherited from integral_constant:

Member constants Inherited from integral_constant:
member constant definition value either true or false
Member functions Inherited from integral_constant:

operator bool: Returns value (public member function)

Example

// is_volatile example
#include <iostream>
#include <type_traits>

int main() {
  std::cout << std::boolalpha;
  std::cout << "is_volatile:" << std::endl;
  std::cout << "int: " << std::is_volatile<int>::value << std::endl;
  std::cout << "volatile int: " << std::is_volatile<volatile int>::value << std::endl;
  std::cout << "volatile int*: " << std::is_volatile<volatile int*>::value << std::endl;
  std::cout << "int* volatile: " << std::is_volatile<int* volatile>::value << std::endl;
  return 0;
}

Output:

is_volatile:
int: false
volatile int: true
volatile int*: false
int* volatile: true